To find the percentage change from 30 to 24, we need to first calculate the difference between the two numbers.

Step 1: Difference = Final Value - Initial Value

Difference = 24 - 30

Difference = -6

Step 2: Next, we need to find the absolute value of the difference. This is because percentage change is always calculated as a positive value.

Absolute Difference = |Difference|

Absolute Difference = |-6|

Absolute Difference = 6

Step 3: Now, we can calculate the percentage change using the formula:

Percentage Change = (Absolute Difference / Initial Value) x 100

Percentage Change = (6 / 30) x 100

Percentage Change = 20%

Therefore, the percentage change from 30 to 24 is -20%. This means that there was a decrease of 20% from 30 to 24.